Table 2. Photophysical data of 8 from solution-based ^a and solid-state ^b measurements.

Medium	Em. λmax (nm)	φ c	τ d (μs)	k r f (104 s–1)	k nr f (104 s–1)
77 K	456, 486, 514	—	11.4	—	—
PMMA film	497	0.07	4.24 e	1.67	22.1
Neat solid	476, 505, 540	0.03	0.94 e	3.20	103.1

^aSolutions at room temperature were non-emissive, and 77 K spectra were measured in 2-MeTHF.

^bPMMA film was prepared as 2 wt%, neat solid was 8 in powder form.

^cQuantum yields were measured using an integrating sphere under N₂.

^d77 K lifetime was measured in 2-MeTHF, PMMA film and neat solid lifetimes were measured in the absence of air.

^eValues obtained from the weighted average of a multi-exponential decay.

^fCalculated according to the equations k_r = φ/τ and k_nr = (1 – φ)/τ, where k_r is the radiative rate constant, k_nr is the non-radiative rate constant, φ is the quantum yield, and τ is the luminescence lifetime.